Adjustable hook



FIG. 1 is a perspective view of an adjustable hook showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a front elevational view thereof, shown in a second configuration of use; and,

FIG. 9 is front elevational view thereof, shown in a third configuration of use. 

CLAIM The ornamental design for an adjustable hook, as shown and described. 